Sewing machine



Sheets-Sheet 1 R. KAIER SEWING MACHINE Filed July 9, 1957 July 2, 1940.

R. KAIER SEWING MACHINE July 2, 1940. l

Filed July 9. 1937 s sheets-sheet 2 varv July 2 1940- R. KAIER SEWINGMACHINE Filed July 9,' 1957 6 Sheets-Sheet 5 6 Sheets-Sheet 4 R. KAIERSEWING ACHIHE Fld July 9, 1937 July 2, 1940.

rtw/114244 qui/Waals:

July 2, 1940. R. KAIER 2,206,285

` sswme cama Filsd July 9, 1957 6 Sheets-Sheet `5 R. KAN-:R

SEWING MACHINE sind .my 9. 1957 July 2, 1940.

6 Sheets-Sheet 6 Patented July 2, 1940 PATENT OFFICE SEWING MACHINERichard Kaer, Cranford, N. J., assignor to The Singer ManufacturingCompany, Elizabeth, N. J., a corporation of New Jersey Application July9, 1937, Serial N0. 152,707

15 Claims.

This invention relates to sewing machines and more particularly to highspeed lock-stitch machines, and has for one of its objects the provisionof an improved lubricating system which will properly lubricate theactuating parts of the machine when the machine is operating.

Another object of the invention is to provide improved mechanism whichis actuated by the knee of the operator for lifting the presser-foot.

A further object of this invention is to provide a new and novel meansfor supporting the machine on a power-table and to provide an improvedbase upon which the sewing machine rests.

With the above and other objects in view,`as`

l5 will hereinafter appear, the invention comprises the devices,combinations, and arrangements of parts hereinafter set forth andillustrated in the accompanying drawings of a preferred embodiment ofthe invention, from which the several l0 features of the invention andthe advantages attained thereby will be readily understood by thoseskilled in the art.

In the drawings: lFigure 1 is a vertical section taken through i5 thecenter of the machine.

Figure 2 is a top plan view of the bracket-arm with a cover-plateremoved to show the actuating mechanism for the feed.

Figure 3 is a bottom plan view of the mechai0 nsm below the bed.

Figure 4 is a vertical section taken substantially along the line 4-4 ofFigure 1.

Figure 5 is a vertical section along the line 5-5 of Figure 1, certainparts being shown in i5 elevation.

Figure 6 is an enlarged face View of the takeup and needle-actuatingmechanism located within the hollo'w head. v

Figure 7 is a vertical section through the 0 bracket-arm taken along theline 1--1 of Figure 2.

Figures 8 and 9 are sectional views taken substantially along the lines8--8 and 9-9 of Figure 2, showing the eccentrics for actuating thefeeding mechanism. 5 Figure 10 is an enlarged sectional view takensubstantially along the line lil-I0 of Figure 3.

Figure 11 is a plan view showing the screen.4

which covers the oil pump.

Figure 12 is a vertical section taken through D the feed eccentrics.

Figure 13 is a disassembledperspective view of the eccentric forimparting a feed-and-return movement to the feed-bar.

Figure 14 is a top plan view of the oil reservoir.

i Figure 15 is a perspective view of the supporting plate for the Wicksused to lubricate the mechanism in the head of the machine.

In the embodiment of this invention selected for illustration,represents the top of a powertable which carries plates 2| and 22through 5 which the bolts 23 pass (Fig. 4). The bolts 23 also passthrough the ears 24 (Fig. 14) formed on an oil pan or reservoir 25, andthe nuts 26 hold the ears against the lower edge of the top 20.

The upper edges of the walls of the oil pan l0 are formed with a groove23 and seated ln the groove is a relatively thick gasket 21 of resilientmaterial. Shallow slots `24 are also provided to drain oil which mayseep into the groove 23 back into the reservoir. The machine has a bed28 15 formed with depending side Walls 29 and end Walls 30 and 30.'Ihese side and end walls form an enclosure and their lower edges restupon the gasket 21 thereby forming a closed container.

Rising from the bed 28 is a standard 3| carry- 20 ing a bracket-arm 32which terminates in a hollow head 33. Journaled in the bearing bushings34y 35, and the self-aligning ball-bearing 36 is a main actuating shaftor needle-bar shaft 31 carrying the usual balance-wheel 3B formed with26 the usual belt groove 39. Secured to the end of the shaft V31 whichextends into the hollow head is a crank-disk 4U carrying a crank-pin 4|which actuates the link 42' of the needle-thread take-up mechanism 42(Fig. 6). Carried by the 80 crank-pin 4| is a second crank-pin 43 whichis embraced by one end of the pitman 44, the other end of the pitmanbeing operatively connected to the needle-bar 45 which is journaled inthe bearings 46 and carries aneye-pointed needle 41. i Interposedbetween each of the crank-pins 4 I and 43 and the ends of the pitman 44and link 42 are a series of small rollers or needle bearings 49 whichserve to reduce friction between these elements and the crank-pins. Alsojour- ,E naled in bearings in the hollow head is the usual spring-urgedpresser-bar 5||carrying a presserfoot 5|. l

Fixed to the shaft 31 by a set-screw 53 is a disk 54 which slidably`carries a plate 55 having an eccentric 56 made integral therewith.Carried by and rotatable relative to the shaft 31 is a.

second eccentric 51 which extends into the centrally located aperture56' in the feed-advancing eccentric 56. The aperture 56' is elongated 50transverse of the direction of movement of the plate 55. Made integral`with the adjusting eccentric 51 is a disk 58 formed with a slideway 58which receives a slidable locking plate 50 formed with teeth 6| whichare adapted to enf l1/2 is to 2.

gage the teeth 62 on a. disk 63 formed on the feedlift eccentric 64which is made integral with a gear 65 and fixed to the shaft 31 by aset-screw 66. The disk 58 is provided with a stud 61 which carries aspring 68 onel of the ends of which reacts against the shoulder 69 ofthe locking plate 60 and the other end reacts against the periphery ofthe 'disk 58. The action of the spring 68 urges the plate 60 so that theteeth 6| and 62 are normally in en gagement. In order to moreeffectively lock the disk 58 and eccentric 51 to the disk 63 andeccentric 64 when the machine is operating at high speed the end 10 ofthe .plate 60, which is on the opposite side of the shaft 31 from theteeth 6|, is made heavier than the end carrying the teeth so thatcentrifugal force will assist in holding the teeth 6| and 62 inengagement.

The feed-lift eccentric 64 actuates the 'pitman 12 which is connected toan arm 13 on the rockshaft 14 (Figs. 3 and 4).. The feed-advanceeccentric 56 actuates a pitman 15 which is connected to the arm 16 onthe rock-shaft 11. A feed-dog 18 which cooperates with the presser foot5| to advance the material is carried by a feed-bar 19, which has one ofits ends pivotally connected to the upstanding arms on the rockshaft 11and its other end operatively connected to the arm 83 on the rock-shaft14. From the above it will be obvious that the eccentric 64 will impartto the feed-dog 19 a. rising-and-falling movement and the eccentric 56will impart a feed-and-return movement to the feed-dog. In order thatthe operator may vary the amount of feeding movement imparted to thefeed-dog. a shouldered plunger 85 extends through an opening in the wallof the standard 3| and is spring urged outwardly by means of the spiralspring 86 which reacts between the wall of the standard and the shoulderof the plunger. A split ring 8l' enters a groove in the plunger to limitthe outward movement of the plunger. To adjust the feed-advanceeccentric the operator pushes the plunger 85 inwardly and rotates thebalancewheel 38. When the notch 88 in the disk 58 is opposite theplunger 85 the end 85 of the plunger enters the notch and engages thelocking plate 60 (Fig. 9) and slides it against the action of the spring68 so that the teeth 6| are disengaged from the teeth 62 therebyunlocking the disk 58 from The disk 58 and adjusting cam 51 are heldstationary by the end 85 of the plunger 05 and when the shaft 31 isturned the movement of the eccentric 51 shifts the plate 55 andeccentric 56 in a right line and relative to the shaftv secured to thevertical shaft is a second geary 92 which meshes with a gear 93 fixed toone end of a hook-shaft 94 which is journaled in the bearings 96 and 96carried by the bed 28, and there is secured to the other end of theshaft a hook 95 of the well known lock-stitch type. The gear ratiobetween the gears 65 and 89 is as 1 is to 11/2 and the ratio between thegears 92 and 93 is as Therefore the hook 95 makes two completerevolutions for each reciprocation of the needle.

To ood lubricate the machine a centrifugal oil pump is driven by thevertical shaft and is located below the level of the oil in the sump 25of the reservoir 25. This pump comprises an impeller 9 9 fixed to thevertical shaft 90 and a casing |00 which surrounds the impeller and isheld in position by arms |0| which are fixed to the bed of the machine.A plate |03 provided with an intake aperture |04 and a screen |05 issecured to the casing |00. A conduit pipe |06 (Fig. 4) conducts the oildischarged by the pump to the bushing 35 from which it is deliveredthrough the aperture |01 in the bushing 35 and radial duct |08 to thelongitudinal bore |09 ln the shaft 31.

The bearing bushing 34 is lubricated through a radial duct |0 whichdelivers oil to the end of the bushing nearest the hollow-head andtheshaft 31 is formed with a spiral groove l which forces the oil along thebushing and back into the bracket-arm. If any oil should leak from thefront of the bushing, it is caught and returned through the bushing bythe conduit |2.

To lubricatethe take-up and needle-bar actuating mechanism which arelocated within the hollow head a supporting plate |3 having turned upedges ||3 (Fig. 15) extends through an aperture in the arm 32 andcommunicates with a well I4 closed at the top by a cap I5. This plaie isheld in position by a screw ||9 which extends through the upper portionof the hollow head. Wicks I6 have their ends located in the well |4 andtheir other ends threaded through pipes ||1 which depend from the plate||3, the ends of the wicks extending slightlyl below the lower ends ofthe pipes. This holds the ends of the wicks in such a position that; theoil is wiped off by the moving parts within the hollow head. Oil issupplied to the wicks by means of two ducts ||8 in the bushing 34. Whenthe machine is operating the oil is under pressure due to thecentrifugal pump and the action of the spiral groove in the shaft 31.This pressure causes the oil to rise through the ducts |8 and saturatethe wick' H6. The excess oil ows over the ends of the Wicks down throughthe Well I4 (Fig. '1) and is drained back into the bracket-'arm througha conduit |20 arranged longitudinally of the bushing 35.

The shaft 31 is provided with radial ducts |2|, |22 and |23 whichcommunicate with the bore |09 and supply oil to the feed-actuatingeccentrics and gear 65. The shaft 31 `is provided with circumferentialgrooves |24 and |25 communicating with the ducts |2| and |22 (Fig. 12).'I'he groove |24 constantly conducts oil to the holes |26 and |21 whichsupply oil to the bearing surface of the feed-advancing eccentric 56.The groove |25 communicates with a hole |28 which supplies oil to thefeed-lift eccentric 64.- The ducts |23 feed` an excess of oil .to thegear 65 and are partially closed bythe hub of the gear 65 so that someof the oil is fed to the face of the gear 65' (Fig. 12) from which it isthrown by cen trifugal force to the teeth of the gear. The upturnedflange |29 (Fig. 1) of the bushing 9| catches some of the excess oil andconducts it between the shaft 90 and bushing 9| for the purpose oflubrication. The bushing 9| is also formed gears and eccentrics and theoil is fed through the duct |33 to the bearing surface of the bushing96'.

'Ihe front bushing for `the shaft 94 is lubricated from an open toppedreceptacle l|34 (Figs. 3 and 4) carried by the bed of the machine. Thisreceptacle collects the excess oiland it is con veyed to the bearingsurface of the bushing 96 by a tube |35 (Figs. 3 and 10) and oil hole|36. To prevent the oil from` escaping at the hook end of the bearingthe shaft 94 is formed with a spiral groove |31 which conveys the excessoil back into the reservoir 25.

To indicate whether or not the pump is working properly and oil isbeing. supplied to the bearing surfaces a cup-shaped member |38 isinserted in the standard 3| of the machine (Fig. 4). 'Ihe member |38 isprovided with an aper- `ture |39 in its top wall and an aperture |40 inits bottom wall. The inside of the member |38 is painted white andit isprovided with a transparent cover |4|. When the machine is operating,excess oil is thrown off by the moving parts and some of this oil owsdown the inner side of the standard 3 I, through the aperture |39 andout through the aperture |40. The operator by simply glancing at themember |38 when the machine is operating can tell whether or not thelubricating system is in operation.

In order that the feed-rock shafts 14 and 11 may be readily assembled inthe machine the end wall 30 is provided with two inserts |68 and |69(Figs. 3 and 10) which are detachably held in place by screws. Toprevent the oil from running along the rock-'shafts and throughA theopening in the wall 30 through which they pass these rock-shafts areeach provided with oilslings |10. 'Ihe needle-bar shaft 31 is alsoprovided with an oil-sling |1| (Fig-1) which is adapted to sling the oilinto the groove in the bushing 34 from whence it is conducted back intothe arm of the machine through the conduit ||2. A sling |12 is alsoprovided to prevent an excess of oil from passing'to and through thebearing 36.

To provide knee-control means for raising and lowering the presser-footthere is formed on the reservoir' a lug |50 and an arm |5| in which isjournaled a rock-shaft |52. Adjustable stops |53 and |54 carried on theends of the shaft limit its movement in either direction. Fixed to the'shaft |52 intermediate its bearings is a lever |55 which is adapted tobe engaged by the knee of the operator and' adjustably secured to theshaft is an arm |56 which engages one end of a rod l|51 extendingthrough a suitable aperture in a boss |58 formed on the reservoir 25.The boss |58 extends above the lever of the oil in the reservoir a'ndthe rod |51 is provided with a cap |51' to prevent oil that may splashon therod from running down and through the aperture in the boss. 'I'heother end of the rod |51 engages one end of a lever |59 which issecured, intermediate its ends, by a pivot-pin |60 to the ears |6| of amember |62 fixed to the bed 28 of the machine. The other end of thelever |59 is connected to one end of a rod |63 which has its other endconnected to a lever |64 pivoted at |65 to the arm 32 of the machine andurged to its normal position by a spring |65. The lever |64 is connectedto the presser-bar `by a link |66 in the usual and well known manner.From the above description it will be obvious that the operator mayraise or lower the presser-'foot by shifting the lever |55.

From the foregoing description considered in connection with theaccompanying drawings, the construction, manner of operation and severaladvantages of my improved sewing machine will be clearly and fullyunderstoodr It is apparents that such a machine has awide variety ofuses,` and it will be understood that the form, construcs.:

tion and arrangement of the elements employed may be varied. Therefore,the privilege is re,- served of resortingto all such legitimate changestherein as may be fairly embodied within the spirit and scope of theappended claims.

Having thus set forth the nature of the inven`` tion, what I claimherein is: i

1. A sewing machine having in combination, a frame, operating mechanismjournaled therein, means for supplying oil to and through some of saidmechanism and in `excess of the amount required, an indicator carried bythe frame of the machine, and means for causing some of the excess oilto flow through said indicator after it has been thrown oif by saidmechanism.

2. A sewing machine having in combination, a frame, operating mechanismjournaled therein, means for automatically supplying oil to and throughsaid mechanism and in excess of the amount required, an indicatorcarried by the frame of the machine, said indicator comprising acup-shaped member with an opening at its top and bottom to permit someof the excess oil which is thrown off by said operating mechanism topass through said member.

3. A sewing machine having in combination, a frame including abracket-arm and head, a shaft journaled in bushings in said bracket-erm,take-up and needle-bar actuating mechanism located within said head, anoil reservoir, means for supplying oil during the operationY of themachine from said reservoir to a well in one of the bushings carryingsaid shaft, a supporting plate located in the head of the machine andwicks carried by said plate, said wicks having their ends extending intothe well in said bushing and their other ends in a position tobeengaging by the needle-bar and the take-up actuating mechanism.

4. In combination, an oil pan having upturned edges, a sewing machineframe carried thereby and having a bed formed with depending side andend walls which rest upon a sound absorbing gasket carried by theupturned edgesof .the oil pan to form an oil `tight enclosure, one ofsaid end walls forming a partition, lower stitch-forming and feedactuating mechanism located on one side of said partition and within theenloA usfr

closure, and a rotary hook, feed-bar and feeddog and shafts havingmovement about their longitudinal axes extend through the partition andconnecting said hook and feed-bar tothe actuating mechanism within thechamber located on the other side of said partition and outside of theenclosure.

5. In combination, a table-top having an opening therein, an oil panformed with upturned edges and secured to said table-top and locatedbeneath said opening, a sewing machine frame having a bed formed withdepending side and end Walls which extend through the opening inl saidtable-top and rest by gravity upon said pan to form a lubricant chamber,the top of said sew- `ing machine bed being flush with the table-top,stitch-forming instrumentalities carried by said frame and locatedoutside of said lubricant chamber and at one side of one of the endWalls formed on the bed, and mechanism carried by said frame foractuating said instrumentalities, said mechanism being located on theother side of the en d wall and within the lubricant chamber.

6. In combination, an oil pan mounted beneath an opening in a table-top,a gasket of soundabsorbing material resting on said oil pan, a sewingmachine with a frame including a bed which extends through said openingand is seated upon said gasket, said frame having no direct metallicconnection with the oil pan and being free to vibrate relative to saidpan, the oil pan and frame forming a dust and lint proof chamber whichhouses the actuating-mechanism of the sewing machine.

7. A sewing machine having, in combination, a frame including abracket-arm and a hollow head, a bushing carried by said frame andlocated adjacent said hollow head, said bushing being formed with an oilwell, a needle-bar actuating shaft journaled insaid bushing and formedwith a longitudinal bore, an oil reservoir, a pump for supplying oilfrom said reservoir through the bore in said shaft to the well in saidbushing, take-up actuating mechanism located within said hollow head anda wick having one of its ends depending in said well and its other endin a position to be engaged by said take-up actuating mechanism.

8. A sewing machine having, in combination, a frame including abracket-arm and a hollow head, a bushing carried by said frame andlocated adjacent said hollow head, said bushing being formed with an oilwell, a needle-bar actuating shaft journaled in said bushing and formedwith a longitudinal bore, means for supplying oil to the bore in saidshaft, radial ducts leading from the bore in said shaft to the bearingsurface of said bushing, ducts in said bushing connecting the bearingsurface with said well, a spiral groove on said shaft for forcing oilthrough said ducts and into said well, needle-bar and take-up actuatingmechanism located within the hollow head, and wicks having their endsdepending in said well and their other ends held in a position to beengaged by the take-up and needle-bar actuating mechanism. l

9. A sewing machine having an arm terminating in a hollow head, take-upand needle-bar actuating mechanism located within said head, a platehaving a portion .which extends into an opening in said arm, a pluralityof depending pipes carried by said plate, wicks having their endsthreaded into said pipes and their other ends extending into the arm ofsaid machine and means for supplying oil during the operation of themachine to the ends of the wicks which ex- -tend into the arm.

sewing machine may vibrate relative to said pan without imparting saidvibrations to the oil-pan and the table by which it is supported.

11. In combination, an oil-pan mounted beneath an opening in atable-top, sound absorbing material carried by said pan, a sewingmachine with a frame including a bed which extends through said openingand rests upon said sound absorbing material, said frame having nodirect metallic connection with the oil-pan and being free to vibraterelative to said pan, the oil-pan and frame forming a dust and lintproof chamber which houses the actuating mechanism of the sewing machineand means within said chamber .for lubricating the actuating mechanismof the sewing machine.

12. In combination, a table-top having an opening therein, an oil-panformed with upturned edges and secured to said table-topand locatedbeneath said opening, a sewing machine frame having a bed which extendsthrough the opening in said table-top and rests upon said pan, the topof said sewing machine'bed being flush with the table-top, and a layerof vibration absorbing material interposed between said bed and saidpan, said sound absorbing material forming the sole support of saidsewing machine.

13. In combination, an oil-pan having upturned edges, a sewing machineframe located above said oil-pan and forming with said oilpan a dust andlint proof chamber, sewing machine actuating mechanism located withinsaid chamber, said mechanism including a needle-bar actuating shaftformed with a longitudinal bore, three bearings in which said needle-barshaft is journaled, a pump also located within said chamber, means forsupplying oil under pressure from said pump to the middle bearing forsaid needle-bar shaft, eccentrics carried by said needle-bar shaft,ducts for conducting the oil from said longitudinal bore to the bearingsurfaces of said eccentrics, a gear carried by said shaft, and a ductlocated relatively to said gear so as to conduct oil from saidlongitudinal bore to the face of said gear from whence it is thrown tothe teeth of said gear by centrifugal force.

I4. In combination, a sewing machine table having an opening therein, anoil-pan secured to the under side of said table beneath saidopening'forming therewith a pocket, a sewing machine having a bed formedwith depending side and end walls which are received in said pocket andrest by gravity upon said oil-pan, a resilient gasket disposed betweensaid pan and said depending side and end walls, and means carried bysaid machine for supplying oil from said oil-pan to the actuatingmechanism of the machine.

l5. In combination, an oil-pan having upturned edges, a sewing machinehaving a bed formed with depending side and end walls which cooperatewith said bed to form a chamber, means within said chamber for supplyinglubricant to the actuating mechanism of said machine, and means forpivotally securing said machine so that it may be tilted relative tosaid pan about a point located above the lower edges of said dependingside and end walls.

RICHARD KAIER.

